tesi R. Miscioscia.pdf - EleA@UniSA

Chapter Chapter 4
4 119
(a):
(a): α(PFTEOS:TEOS (PFTEOS:TEOS (PFTEOS:TEOS on on Glass)
Glass)
= 111.5 111.5° °
(b (b): ): α(PFTEOS:TEOS (PFTEOS:TEOS (PFTEOS:TEOS on on Glass)
Glass)
= 111.5° 111.5
figure 55:
contact contact angle angle measurements measurements on on P
P PPFTEOS:TEOS
FTEOS:TEOS FTEOS:TEOS deposited
deposited (a): on on Glass,
Glass, (b): (b): on on Cr/Au
Cr/Au
surface
surface
As As a a reference, reference, th
th the e e contact contact angle angle of
of DI DI water water on on a a simple
simple
PMMA PMMA (thickness (thickness 200nm) 200nm) surface surface deposited deposited on on glass glass is is reported reported to
to
validate validate the the 10nm 10nm buffer buffer layer layer processing processing (see
(see figure figure 6). ). Taking Taking into
into
account account this this information information about about a a plain plain PMMA PMMA surface, surface, we we measured
measured
wettability wettability on on PMMA PMMA buffer buffer layers layers (10nm) (10nm) on on PFTEOS:TEOS
PFTEOS:TEOS
showing showing a a contact contact angle angle of of 70° 70° which which is is really really near near the the one one we
we
obtaine
obtained d d for for the the initial initial case case of of PMMA PMMA (
( (figure figure 6) ) proving proving the
the
effectiveness effectiveness of of the the buffer buffer layer layer deposition.
deposition.
figure 66:
: : Contact Contact angle angl e e on on a a 200nm
200nm-thick thick thick cured cured film film surface surface of PMMA (67.2°) .
3.3.2
3.3.2 Scanning Scanning Electron Electron Microscopy Microscopy (SEM) (SEM) imaging imaging of
of
channel channel morphology
morphology
The The knowledge knowledge of of surface surface morphology morphology of of the the charge charge transport
transport
medium medium is is fundamental fundamental because because it it is is one one of of the the ways ways to to predict
predict
device’s
device’s performances performances without without making making a a complete complete device. device. T
T TThe
he he use use of
of